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Water 2016, 8(5), 214; doi:10.3390/w8050214

The Contribution of the Type of Detergent to Domestic Laundry Graywater Composition and Its Effect on Treatment Performance

Water Center for Latin America and the Caribbean, Tecnológico de Monterrey, Av. Eugenio Garza Sada Sur No. 2501, Col. Tecnológico, Monterrey, NL C.P. 64849, Mexico
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Academic Editor: Andreas N. Angelakis
Received: 13 April 2016 / Revised: 17 May 2016 / Accepted: 17 May 2016 / Published: 20 May 2016
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Abstract

In this study, the contribution of liquid and powder detergents to the composition of domestic laundry graywater was evaluated. Dosages recommended by the manufacturers were used to prepare detergent solutions and generate laundry graywater. Solutions and graywater were characterized in terms of total solids (TS), total suspended solids (TSS), total dissolved solids (TDS), chemical oxygen demand (COD), total organic carbon (TOC), and concentration of Linear Alkylbenzene Sulfonates (LAS’s). Additionally, the effect of the type of detergent on the treatment performance was also assessed. The coagulation–flocculation process was selected as a potential alternative for treating domestic laundry graywater. Treatment performance was assessed based on the removals of TS, TSS, TDS, turbidity, COD, and electrical conductivity (EC). Optimum coagulant dosages and mixing conditions for flocculation were determined. The results indicate a differential contribution of the type of detergent to the domestic laundry graywater composition. Liquid detergents contributed with more COD and TOC and fewer solids and LAS’s, in comparison with powder detergents. Soiled clothes increased the solids and organic loads of laundry graywater; furthermore, the laundry process reduced the LAS concentration of graywater by 77% for the liquid detergent and 47% for the powder detergent. On the other hand, the coagulation–flocculation process was more effective in treating powder detergent graywater even though the liquid detergent graywater was less polluted. Removal efficiencies on the order of 95% for turbidity and 75% for TSS were achieved for powder detergent graywater; meanwhile, for liquid detergent graywater, the removals were 73% for turbidity and 51% for TSS. View Full-Text
Keywords: coagulation–flocculation; soiled clothing; detergent type; domestic laundry graywater; treatment performance coagulation–flocculation; soiled clothing; detergent type; domestic laundry graywater; treatment performance
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

López Zavala, M.Á.; Espinoza Estrada, E. The Contribution of the Type of Detergent to Domestic Laundry Graywater Composition and Its Effect on Treatment Performance. Water 2016, 8, 214.

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